Association is the following:

• A voluntary association (also sometimes called an association) is a group of individuals who voluntarily enter into an agreement, explicit or implicit, to form or act as a body (or organization) to accomplish a purpose.
• In object-oriented programming, an association (object-oriented_programming) is a relationship between classes.
• In statistics, an association (statistics) comes from two variables who are related.
• In psychology, an association (psychology) is something linked in memory or imagination with a thing or person.
• The pop band The Association.
• In Archaeology an association is the relationship between objects found together